Injection and Infusion Coding: What You NEED to Know! Not all injections are created equal and in the CPT Medicine section, the difference between an IV infusion, an IM injection, CPT 96372: Injection Billing Made Simple for Medical Practices CPT Code 20610: Joint Injection and Aspiration Billing Guide Vitamin B12 Medicare Coverage and Co Pay Details GoodRx If a patient comes in for an injection only Medicare primary. Can the medicine be billed to Medicare b since an only pays the air? Or do you have to eat it?